Investors should be more vigilant, as the word ‘fiduciary’ is becoming a promotional bonanza for brokers and financial advisers

Even if the government stops pushing retirement advisers to act in your best interest, many have already decided to do so—or convince you that they are.

On Feb. 3, the White House ordered the Labor Department to review its rule on fiduciary duty, which would require brokers getting paid to provide investment advice on a retirement account to act solely in the best interest of the client. Five days later, a federal judge in Texas rejected a legal challenge to the Labor Department’s rule.